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Increased precipitation rather than warming increases ecosystem multifunctionality in an alpine meadow

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Abstract

Backgrounds

Climate change is well-known to alter the structure and function of grassland ecosystems, and multifunctionality contributes to a comprehensive understanding of the impacts of climate change on ecosystem functions. Warming and humidification are predicted to be the climate change trend on the northeastern Qinghai-Tibetan Plateau. However, understanding of how long-term warming and increased precipitation affect ecosystem multifunctionality in alpine meadows is still limited.

Methods

Here, we conducted an 8-year field experiment involving warming and increased precipitation in an alpine meadow to explore how warming, increased precipitation, and their interaction affect ecosystem multifunctionality.

Results

The results indicated that increased precipitation had a positive effect on ecosystem multifunctionality. However, warming and the interaction of warming and precipitation had no significant effects on it. Warming decreased species richness and plant coverage. Increased precipitation enhanced aboveground carbon (C), nitrogen (N), and phosphorus (P) pools of plant community, and soil moisture, but decreased soil pH. Aboveground P and N pools of plant community and microbial biomass nitrogen (MBN) were important predictors of ecosystem multifunctionality.

Conclusion

This study demonstrated long-term increased precipitation can enhance ecosystem multifunctionality by indirectly affecting the individual functions (aboveground P and N pools of plant community and MBN), soil moisture, and pH in an alpine meadow. These findings highlighted that increased precipitation is more critical than warming for enhancing ecosystem multifunctionality in semi-arid alpine meadows.

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Acknowledgments

This work was financially supported by the National Natural Science Foundation of China (Grant No. 32171685 and 31971746) and the second batch of forestry and grassland ecological protection and restoration funds in 2020: Qilian Mountain National Park Qinghai Area Biodiversity Conservation Project.

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Correspondence to Xinqing Shao.

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The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.

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Shi, L., Lin, Z., Yao, Z. et al. Increased precipitation rather than warming increases ecosystem multifunctionality in an alpine meadow. Plant Soil 498, 357–370 (2024). https://doi.org/10.1007/s11104-023-06441-5

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  • DOI: https://doi.org/10.1007/s11104-023-06441-5

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